1 example for join
# Perform a join on the columns stored in two files, like a SQL join: $ echo -e "\na:" ; cat a ; echo -e "\nb:" ; cat b ; echo -e "\njoin:" ; join a b a: 1 mike hix 2 grant holly 3 chicken noodle b: 1 coconuts 2 eggs 3 soup join: 1 mike hix coconuts 2 grant holly eggs 3 chicken noodle soup